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Continental vs. Continental Divergent Plate Tectonics Plate Boundaries Convergent Transform Continental vs. Oceanic Oceanic vs. Oceanic This boundary is caused by convection currents in the asthenoshere pulling two plates apart. A divergent boundary happens when two plates are separating. Then convection currents in the asthenoshere push magma to the surface. Pushing aside the old rock. All of this creates rift valleys and mid-ocean ridges. The theory of Sea floor Spreading was discovered because of the divergent boundary between the North American plate and the Eurasian plate. Constructive or Destructive? The divergent boundary is a constructive boundary. Why is this? This is because the lava being pushed up hardens to generate new crust. Transform boundaries are created by the movement of the Earth.A transform boundary occurs when two plates are sliding past each other. When they are sliding past each other the plates often "jump" creating an Earthquake. Transform boundaries also create fault lines across the ground. Constructive or Destructive? A transform boundary is a destructive boundary. This is because a transform boundary causes Earthquakes. Which can cause a lot of destruction. This boundary is caused by convection currents in the mantle pulling two continental plates together. Neither plate subducts, so they crash into each other. This type of convergent boundary creates mountain ranges. Constructive or Destructive? This is a constructive boundary. Why? It is a constructive boundary because it makes huge mountain ranges like the Himalayas and the Rocky mountains. The continental vs. oceanic boundary is made by convection currents in the asthenoshere pulling an oceanic and continental plate together. The denser oceanic plate subducts under the continental plate at the subduction zone. This plate boundary creates trenches and volcanoes. Constructive or Destructive? This boundary is both constructive and destructive. Let me explain why. Trenches are constructive because they create new habitats and destructive because they break into land. Also volcanoes are constructive because they produce new rock and destructive because they can explode and destroy miles of landscape. The oceanic vs. oceanic boundary is caused by convection currents in the middle mantle pulling two oceanic plates together. The older oceanic crust subducts under the newer crust at the subduction zone. Oceanic vs. oceanic boundaries form island arcs and trenches. Constructive or Destructive? The oceanic vs. oceanic boundary is both destructive and constructive. This is true because this boundary forms trenches and island arcs. Trenches can be constructive because they create new habitats for marine life, but they can also be destructive because they cut through the sea floor. Island arcs are destructive because they have violent volcanic explosions. They are also constructive because they create new islands.